Precast Prestressed Concrete Composite Shear Wall With Medium Shear Span Ratio Seismic Performance Research

The assembled shear wall structure can effectively improve the construction efficiency and save labor,and at the same time can achieve low carbon,energy saving and environmental protection.It can be widely used in civil high-rise buildings and has broad application development prospects in my country's future construction industry.At present,the prefabricated shear wall structure forms used in China mainly include prefabricated solid shear wall and superposed shear wall.These two structural forms have some shortcomings in practical application.It is more convenient to construct and develop a more reasonable structure.,The assembled shear wall system with more superior performance will undoubtedly enrich the structural form of assembled shear walls,and will also promote the development of construction assembly in China.Under this background,this paper proposes a new type of precast prestressed concrete composite shear wall.On both sides of the wall are two prefabricated reinforced truss prestressed concrete slabs,with a cavity formed in the middle,and vertical stressed steel bars are arranged in the cavity.And pouring concrete.Prefabricated steel truss prestressed concrete slabs are equipped with prestressed steel bars.The steel truss truss of the precast slabs act as tie bars to provide shear resistance at the interface between the new and old joints between the precast slab and the post-cast concrete.In this paper,a full-scale cast-in-place shear wall and two prefabricated prestressed concrete reinforced steel truss superposed shear wall full-scale specimens are designed and manufactured.The shear span ratio of the specimens is 1.5,which mainly considers the influence of the axial compression ratio.The pseudo-static seismic test of the test piece was carried out,and the crack development rule,failure form,bearing capacity,energy dissipation capacity and stiffness degradation of the precast prestressed concrete reinforced concrete truss shear wall were studied.The walls were compared.The test results show that the prestressed prestressed shear wall and the cast-in-situ shear wall have bending shear failure,there is not much difference;the crack distribution and development mode of the two walls are different,and the prestressed steel effectively limits the development of diagonal cracks.The two specimens performed similarly in terms of seismic performance and even slightly outperformed cast-in-place walls in terms of hysteretic energy consumption.Using the finite element analysis software ABAQUS,a finite element model of the prefabricated prestressed concrete reinforced truss shear wall was established to simulate its load-displacement curve under the pushover condition.The numerical value of the simulation analysis is slightly different from the test data,but the trend and peak value are different.Not large,it can better reflect the actual test results.